I'm glad I don't need fcgi, it was unclear from the owncloud site(s) and docco.
owncloud is up and running okay. I'm not trying to improve performance, just to get webdav working.
I have this symptom:
https://forum.owncloud.org/viewtopic.php?f=17&t=30646... but the fixes all involve fastcgi, and without confirmation otherwise, I've proceeded believing that it was necessary to set that up. I've done SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1 but it doesn't seem to have helped -- I don't know how to test to see if it's taking effect.
Of course, SME Server forums can't be expected to help me fix owncloud, and they won't be able to help much with SME I expect so I'm feeling a bit stuck!
I suppose the next thing to try would be to setup a proper SSL cert. FWIW cadaver tries to authenticate but also fails.
Thank you in advance for any other comments!